Do either of these platforms offer anything unique as opposed to the standard "lease renewal reminders"? 

Don't accurately represent the neighborhood/property classification.Don't have consistent rehab standards for all propertiesDon't provide a scope of work for the renovation that they have done.Are they a turn-key company or are they a promoter?

Starting with a private lender loan and standard tenants may be simpler for your first property.

I mean if its standard, and theres no way around it, then sure. 

I'm an agent in Oklahoma and we have a Seller Finance addendum written up by the state real estate commission that functions just like an FHA or Conventional Loan addendum to a sales contract.This is, of course, standard when you purchase a home with bank financing.

Talk to the building inspector, they're the ones who handle egress for us and they are the ones who set the standard on what is a safe means of egress.

Is there a standard termination agreement a seller should use with a realtor in the state of Texas? 

The inspection requirements can vary, but properties usually need to meet their safety and livability standards.

We put in around $15,000/$20k worth of construction & furnishings to bring it up to Airbnb standards.

One tenant in particular that was a nightmare (we had to evict and learned some HARD lessons with house standards), which impacted another tenant who started also being difficult.